FML can't load mods, or Forge server doesn't recognize them

[Kayduxer]

Hi!

I'm hosting a Forge server with just 2 mods (Ultimate Car and Traverse, both downloaded from CurseForge). I'm using the build #2838 (client and server), because SpongePowered need it (anyway I tried with the most recent version, and with the recommended version, but I get the same results).

I have tried to solve the error by hosting the Forge on other (physical) servers, and I get the same error. I have also tried to connect from different computers (in case the problem was with my PC), but nothing changes.

The problem is that (if I do not misunderstand) the server is unable to identify the mods that the client has in use, this being the reason why access is prevented.

 

Images:

 

Client logs:

launcher_log.txt

latest.log

debug.log

 

Server logs:

latest.log

debug.log